@annotaion.tailrec added
def tail added
Patrick's fibsZip... -> StackOverflow...
runars lazy unfold
still does not working for me...
runars lazy unfold
still does not working for me...

book drop

Book drop
made append lazy in argument
Merge branch 'ch05' of https://github.com/zaphod66/myfpinscala into ch05

Conflicts:
	src/main/scala/fpinscala/laziness/StreamWS.sc
Merge branch 'ch05'